General Purpose Flux Thinner is a solvent that is used to thin Water Soluble, No Clean and RMA fluxes in foaming and some spray applications.  Common Flux Thinner is typically used in conjunction with the AIM n.020 Titration Kit.  Use of Common Flux Thinner is suggested when the flux acid number is too high due to solvent evaporation or residues increase due to evaporation.  Follow the instructions outlined in the AIM n.020 Titration Kit procedure when diluting flux products.